25525306500 has 96 divisors (see below), whose sum is σ = 74568539136. Its totient is φ = 6784876800.

The previous prime is 25525306493. The next prime is 25525306501. The reversal of 25525306500 is 560352552.

It is not an unprimeable number, because it can be changed into a prime (25525306501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 442317 + ... + 496683.

It is an arithmetic number, because the mean of its divisors is an integer number (776755616).

Almost surely, 2^25525306500 is an apocalyptic number.

25525306500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25525306500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37284269568).

25525306500 is an abundant number, since it is smaller than the sum of its proper divisors (49043232636).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25525306500 is a wasteful number, since it uses less digits than its factorization.

25525306500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54702 (or 54690 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 33.

The spelling of 25525306500 in words is "twenty-five billion, five hundred twenty-five million, three hundred six thousand, five hundred".